Well id recommend some gears. It doesnt necessarily add hp, but youll have a lot more low end torque from it. Out of your brasic bolt ons, you will feel gears a whole lot more than anything else. Go with 3.73 or 4.10 depending on what your future mods are and if you have a 5spd or auto. And all around it should cost you 400-500 after everything. Then get ya a nice exhaust setup to get her sounding right.
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